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Writing / Reading VRAM - noob questions

by siudym on 12-12-2021, 00:36
Score: 162.94 %, Type: Forum topic , Comments: 89 comments
rom/ram: data_to_copy: db %11111111, %10000001, %10100101, %10100101, %10000001, %10111101, ... is no way to read the actual value of the VDP registers, so the BIOS save their values in RAM each time you ... still find it good practice to update the register mirrors in RAM. Is this code that copies Is ...

Writing my first (simple) game in assembly

by Pbk71 on 23-05-2021, 08:22
Score: 194.39 %, Type: Forum topic , Comments: 48 comments
loop set the sprite attributes in RAM immediately instead of a separate RAM value, that way ... bios call to block transfer RAM to VRAM RG1SAV: equ #F3E0 ; mirror of VDP register #1 ; --- ... or VDP_SI_16x16 ld hl,RAM_SPRITE_ATTR_0 ld de,SPRITE_ATTR ld bc,SPRITE_ATTR_SIZE * NR_OF_SPRITES ...

Writing original version of SD Snatcher to disk

by uberjack on 26-11-2018, 05:35
Score: 123.23 %, Type: Forum topic , Comments: 25 comments
Correct me if I'm wrong. The copy protection comes from the fact that these games (SD Snatcher and Snatcher, and KGC disks) game with the SCC+ cart which has some additional (non-standard) RAM. The games will not work without this RAM (without cracking them). EDIT: The carts are different, i.e. the RAM is mapped ...

writing to flashrom (2MB rom) and support for emulators

by norakomi on 17-09-2020, 22:13
Score: 148.12 %, Type: Forum topic , Comments: 75 comments
(also called STARTUP, RESET or BOOT) ; Address : #0000 ; Function : Tests RAM and sets RAM slot ... RAMAD0 equ 0F341h ; MSX-DOS (Disk-ROM) System Variables located in RAM : Slot address of RAM in page 0 (DOS) RAMAD1 equ 0F342h ; MSX-DOS (Disk-ROM) System Variables located in RAM : Slot address of RAM ...

Wrong version of command

by [D-Tail] on 19-02-2010, 19:50
Score: 90.27 %, Type: Forum topic , Comments: 11 comments
Program Area. This is the free RAM (from the ordinary Z80's 64K) that MSX-DOS uses to load .COM files ... it is not needed to go trough basic to free up r I found out it is not needed to go trough basic to free up ram ... version 2.20 and command version 2.41 the game would run just fine, if I just had more than 128k memory ...

WTB (SD)Snatcher cart/Ese-SCC/MegaFlashrom SCC

by syn on 19-02-2018, 21:23
Score: 124.41 %, Type: Forum topic , Comments: 13 comments
for RAM expansion, its value would drop down by probably 100€ You also have the possibility ... or Megaflashrom SCC (original SCC) or I might even consider full (sd) snatcher games but that depends ... seem to be in good shape. I just know that I'm not gonna pay 400 euros for a game. Thanks ...

WTB FM-PAC

by Phantom on 02-06-2007, 13:46
Score: 86.87 %, Type: Forum topic , Comments: 33 comments
for a panasonic MSX2+ including 3 cartridge games on ebay not long ago.... (8 days ago)seems like a better deal... (the panasonic is now upgraded to 512kb using old ram chips I got for free) and of course the FM PAC ... are there any major drawbacks to getting a non-official FM-PAC instead? E.g., do a lot of games use or require ...

WTB large memory mapper (2mb or 4mb)

by Moniz on 30-08-2021, 16:06
Score: 146.47 %, Type: Forum topic , Comments: 24 comments
don't know what. If you, or anyone else has a 2MB or 4MB Gouda RAM cartridge, I'd like some high ... only the ram, but for me the real SID chip is the real diamond of this cartridge! Especially if you ... don't know if you can use all the ram in an expander, I think not. And I don't have the setup ...

WTB MegaFlashROM SCC 512kB

by Retrofan on 18-07-2013, 19:24
Score: 100.22 %, Type: Forum topic , Comments: 42 comments
in RAM to simulate a cartridge, why? Can you explain, please? Do you see any illegal ROM in my ... machines. If you want to use them for play pirated games, it's up to you. But don't think all ... them for pirated (konami) games, and the scc chip inside it does not help your case. If you own ...

WTB or trade: external RAM mapper

by pitpan on 06-12-2010, 19:21
Score: 225.45 %, Type: Forum topic , Comments: 22 comments
I'm looking for an external RAM mapper with any size between 1 Mbit and 4 Mbit (128-512 KB) ... of hardware/software to trade: 4 Mbit MegaRAM, 4 Mbyte external mapper, some Konamis, etc. i think you ... have the original Cartridge of DOS2 with 256k Ram inside and on Package is just MSX2 symbol ...
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